I cannot emphasei the above enough.
Imagine if you will, you are a 98 lb person in your 80’s. You suffer from multiple chronic medical conditions, including dementia. You do not have DNR when you go into cardiac arrest. The result is a 200+ pound person climbing over you and pushing on your chest will the full force of his/her body to try to bring you back. Then they use paddles and try to shock you back. The pushing breaks multiple ribs, and the paddles cause scars. Over the course of a day, you may code multiple times and each time the same procedure is repeated. You recover but what is your quality of life as an older person with several broken ribs that take much longer to heal than a younger person would.
My mother had a DNR; one thing we found out when she broke her lip last winter…in surgery DNR doesn’t count. They don’t want to screw up their numbers. She didn’t code on the operating table (hip replacement), but she did in the skilled nursing facility a couple of days later. she was allowed to pass peacefully because she had a living will, DNR and my sister as Healthcare Power of Attorney.